If you have a larger business, you may want to consider putting out an employee newsletter at least once a week. This can contain almost anything you want, and you can even ask your employees to contribute if you want to do so. You can make it all about business, or you can add some personal touches as well. This might be a great way to keep your company feeling like one big family instead of a bunch of people who may know very little about each other.
One great thing about an employee newsletter is that you can minimize how many memos you have to send out. If something in no urgent, you can save it for the employee newsletter.

These can go out via email, and most companies prefer to do it this way. You can send it out to any branch offices you may have, and you can also send it rather fast to any employees who may be traveling for business reasons. It is also a great way for those on vacation or leave to keep up with what is going on.
You may want to have one employee in charge of the employee newsletter, and you can decide what you want it to be, and then put the information in their hands each week to get it done. You may also want to ask department heads to forward things to you that they might want to have included in the employee newsletter so that everyone has a spot to put important information that might affect the entire company and how things are done.

Things like schedules for computer repairs or upgrades can be included so no one is caught unaware.
You may also want to add some personal touches to your employee newsletter. Things like birthdays, anniversaries, births, and other special moments can be listed. This gives employees a chance to get to know one another as people and not just coworkers. Sometimes this helps tremendously with inter office politics and helps everyone see each other as real people rather than just a name on an email. You can do what is best for your company, of course, but the reasons for having an employee newsletter already outnumber the reasons not to. Just make sure you keep an eye on it so it does not turn into something other than what you envisioned in the first place.
.